.\" -*- nroff -*-
.\" Copyright (c) 2010-2014 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" Copyright (c) 2020      Google, LLC. All rights reserved.
.\" $COPYRIGHT$
.TH MPI_Abort 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Abort\fP \- Terminates MPI execution environment.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Abort(MPI_Comm \fIcomm\fP, int\fI errorcode\fP)

.fi
.SH Fortran Syntax
.ft R
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_ABORT(\fICOMM\fP, \fIERRORCODE\fP, \fIIERROR\fP)
	INTEGER		\fICOMM\fP,\fI ERRORCODE\fP,\fI IERROR

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Abort(\fIcomm\fP, \fIerrorcode\fP, \fIierror\fP)
	TYPE(MPI_Comm), INTENT(IN) :: \fIcomm\fP
	INTEGER, INTENT(IN) :: \fIerrorcode\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH INPUT PARAMETERS
.ft R
.TP 1i
comm
Communicator of tasks to abort.
.TP 1i
errorcode
Error code to return to invoking environment.

.SH OUTPUT PARAMETER
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).

.SH DESCRIPTION
.ft R
This routine makes a "best attempt" to abort all tasks in the group of
comm. This function does not require that the invoking environment take any
action with the error code. However, a UNIX or POSIX
environment should handle this as a return errorcode from the main program
or an abort (errorcode).
.sp
The long-term goal of the Open MPI implementation is to terminate all processes in all tasks that contain a process in \fIcomm\fP, and the error code is not returned to the invoking environment. At the moment, this isn't fully implemented and MPI_Abort will terminate the entire job.
.sp
Note: All associated processes are sent a SIGTERM.

.SH ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler
may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

